Combined signaling and telephone system.



M. J. OABNEY. COMBINED SIGNALING AND TELEPHONE SYSTEM.

APPLIOATION IILED 11mm, 1004.

1,099,338. Patented June 9, 1914.

4 SHEETS-SHEET 1.

M. J. GARNEY.

COMBINED SIGNALING AND TELEPHONE SYSTEM.

I APPLICATION FILED DEG. 27, 1904. 1,099,338, Patented June 9, 1914.

4 SHEETB-SHEET 2.

I I I I'I I'I F COLUMBIA PLANDGIIAPH URL-WASHINGTON. E'C.

M. J. GARNBY.

COMBINED SIGNALING AND TELEPHONE SYSTEM.

APPLICATION TILED DEC. 27, 1904.

1,099,338. Patented June 9, 191% I 4 SHBETB SHBE-T a.

M. J. UARNBY. COMBINED SIGNALING AND TELEPHONE SYSTEM.

APPLICATION FILED D120. 27, 1904.

1,099,338., Patented June 9, 1914.

4 SHEETS-SHEET 4.

C OLUMBIA PLANOGRAPH CDuWA-SHINOTON, D- C.

MARTIN J. CARNEY, OFCHICAGO, ILLINOIS.

COMBINED SIGNALING AND TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented June 9, 1914.

Application filed December 27,1904. Serial No. 238,420.

To all whom it may concern:

Be it known that I, MARTIN ICARNEY, a citizen of the United States of America,and resident of Chicago, Cool: county, Illinois, have invented a certain new and usefulImprovement in Combined Signaling and Tele phone Systems, of whichthe followingvis a specification.

My invention contemplates a combined signalingand telephone system in which the means for transmitting and receiving fire alarm, police patrol, burglar alarm, night watch, messenger call, and other various similar signals, are totally distinct from and independent of the means for carrying on telephonic communication,and from the signaling transmitting and receiving evices used or required as a part of the telephone apparatus for furnishing telephonic service to system.

Generally stated, the object of my invention is to provide a comparatively simple and highly efficient system of the foregoing character; and a special object is to provide such a construction and arrangement as will lines to be used for other signals at the the different subscribers of thep permit the subscribers transmitting alarms or same time that the circuits are being used for telephonic purposes, without causing any conflict between the two operations; and it is, also an object to provide certain details and features of improvement tending to increase the general efficiency and serviceability of a system of this particular character.

To the foregoing and my other useful ends invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings Figure 1 illustrates a common battery telephone system in which one side of each subscribers metallic line circuit may also serve as a part of a grounded call-box circuit. Fig. 2 is a similar diagram of a common battery and telephone system, but in this case the callbox circuit includes one side of each of two subscribers lines and is not grounded as in the preceding figure. Fig. 3 illustrates the call-box circuit arrangement of Fig. 1 applied to a local battery telephone system. Fig. t shows the call-boX circuit arrangement of Fig. 21 applied to a local battery. telephone system.

It will be readily seen that the telephone l circuits and apparatus may be of any suitable known orapproved character.

apparatus may also be of any suitable or desired character. For this reason a detailed illustration of the various devices will be unnecessary.

As illustrated in Fig. 1, my invention comprises a pair of subscribers line wires 1 and 2 leadingfrom a central station or exchange to the subscribers station. At the telephone exchange the said subscribers line, which is of the complete metallic circuit type, terminates in spring-jacks A, B and C and in a battery or central source of cur- 'ent D. The telephone switchboard operator is provided with the usual cord-plug E, adapted for insertion in the said springjacks. The subscriber attracts the attention of the telephone switchboard operator by means of a line lamp signal F when a connection with some other subscribcrs line is desired. The subscriber signals the operator through the medium of a supervisory lamp signal Gr when a disconnection is desired. At the subscribers stationthe equipment includes the usual battery transmitter II, the receiver I, the hook-switch J, induction coil K, call-bell L, and condenser M. Any suitable arrangement of relays can, of course, be employed for controlling the circuits of the two lamp signals at the exchange or central station. In addition tothe apparatus thus employed for giving telephone service, the line wire 2 is connected at the exchange or central station, or at some other place, with a signal receiving apparatus adapted to receive district messenger calls, or other similar signals. As shown, the said signal receiving apparatus, which is totally distinctfrom and independent of the signal receiving devices for effecting telephone connections, comprises a low frequency alternating current generator N connected with the line wire 2 through the medium of a re lay magnet O and impedance coil I" and a condenser Q. The said relay magnet has an armature 0 adapted to control a local circuit including a battery 0 and the usual rccorder or signal-receiving device 0 If desired, the said local circuit may also include magnets of one or more relays R for repeating the signals to otherof'lices or stations. It will also be seen that the said generator N is preferably grounded at n. In thisway The different devices employed in the signaling the said generator is inductively connected with the line wire 2, and suitably connected With the ground. At the subscribers station, or at some other outlying place or station, the same line wire 2 is connected with ground at 3. In this connection, between. the line wire 2 and the ground, one or more call-boxes 4 can. be connected in parallel, so thatthe connection to ground is normally open. With this arrangement, the icondenser Q stops the flowof battery current from the battery D, but permits the current to flow out on the line from the generator N when one of the boxes 4 is operated. In other words, the operation of one of the -boxes4 results in the intermittent opening and closing or make and break connection 7 in a grounded circuit, including the ground mitted by the relay Oto the local circui't'including therecorder, or other appropriate signal receiving device 0 At the same time that a district messenger or other similar signal is being transmitted over a circuit, including one side of a subscribers line, the telephone apparatus or equipment at the subscribers station may be employed for either signaling or communicating with the operator at the central station or exchange or with some other subscriber. Thus in a system such as shown in Fig.1 two distinct kinds of service may be given, neither one conflicting with the other. This is for the reason that although one side of each sub scribers line may be common to both kinds of service, the transmitting and receiving device for one kind of service are totally distinct and independent from the transmitting and receiving devices employed in giving the other kind of service. In other words, the operator who receives the calls for telephone connections has nothing What'- ever to do with the signal receiving devices byWhICh a district messenger call or other similar signal, is transmitted over the same So, also, the subscribers telephone equipment connected with ahne may be 111.

line.

use at the same time that some one is using a call-box connected with the same line. And thus the two services, to-wit, the 'telephonic service and the call-box fire alarm, police patrol, or other similar service, are 'operatively distinct and independent of each other,"although structurally the two kinds of service are each dependent upon the same subscribers line wires. The ground connection from the battery D may be provided with an impedance coil 8 so as to prevent the passage of either voice orgenerator c'ur rents. It will be understood that the impeda'nce coil P also serves to prevent'the passage of voice currents,although not of a character to prevent the passage of the necessary generator currents.

In Fig. 2 the telephone apparatus is the same as in Fig. true of the call-box apparatus. In Fig. 2, however, N is bridged across fromthe subscribers line wire a to the subscribers line wire a of another line. In this bridge, at each side of said and the impedance coils P -P Said bridge, also includes the magnet of a relay O In Fig. 2 the signal receiving apparat'us is the same as that shown in Fig. 1'. At the subscribers station or at the other outlying are also bridged from one line a tothe other line wire a Consequently, in'Fig. 2 the telephone circuits are not only entirely metallic, but theci'rcuits for the call-boxes are also entirely metallic. Each call-box .cir-

1, and this is practically it will be seen that the generator places or stations, the call-boxes 4 Y cuit includes-one side of each of two subscribers lines. Obviously,however, and as in the previous case, the apparatus 'for receiving the call-boX signalsis totally distinct from the apparatus forreceivingthe telephonic signals. The means for transmitting the signals by which the subscriber gets a telephone connectionare also totally distinct from the call-boxes or transmitting devices by which thefdist-rict messenger, police patrol or firm alarm signals are transmitted. For this reason, as in the previous case, the apparatus for giving telephone service is totally distinct from and in no way con'flicts with the apparatus for giving the district messenger, trol, or other like service.

In Fig. 3 the call-box apparatusthat is to say, the apparatus by which the district messenger, fire alarm 'or police signals are transmitted and. received, is the same as that shown inFig. 1-. In Fig. 3, however,the said call-box transmitting and receiving apparatus is applied to all telephone systems employing local batteries T at the. subscribers station, described centralsource of current. Butthe call-box circuit in Fig.3 is the same as in- Fig. l, as it is simply a grounded circuit in.-

cluding only one side of the subscribers line. In Fig. 3, the subscriber uses a generator U for operating the calling and clearing out drops or relays V and V at the central station. The operation of a telephone system of this character'will be readily understood. I i I In- Fig. 4 the call-boxes and devices for.

receiving the signals transmitted by the call-boxes are connected with the line wires in a manner similar to that In Fig. 4, however, the telephonic apparatus fire alarm, police pashown in Fig. 2. 7

or system is of the character shown 1n. Fig.

3. In other words, in Fig.4, the local bat-i teries T are employed at the subscribers stations, and the signals for telephonic connections and disconnections are effected through the medium of a generator U at the subscribers station, and the drops or relays V and W at the central station.

It is evident, therefore, that a system embodying the principles of my invention may be constructed in various ways. In any case, however, it .will be seen that no single subscribers line is included in both sides of a call-box circuit, but the arrangement being preferably of such character that each subscribers line-that is to say, each sub scribers line employed for such purposeserves merely as one side of a call-box cir cuit. Furthermore, it will be seen that the arrangement is preferably such that only one side of each metallic telephone sub scribers line circuit is appropriated for use as one side of a call-boxcircuit. Inother words, even though the call-box circuit is entirely metallic, it is preferable to obtain a circuit of this character by employing only one side of eachof two metallic subscribers line circuits. It is obvious, however, that both sides of each subscribers metallic line circuit may be employed for call-box service and that this may or desired manner.

From the foregoing it is obvious that I employ the ordinary telephone subscribers line wires, or that I employ any other suitable line wires for giving different kinds of service, each service beingtotally distinct from and independent of the other, so far as operations are concerned, but the difierent kinds of service, and the system as a whole, being dependent upon the same subscribers line wires. Of course, may be installed first, and the call-box police patrol, fire alarm or other like apparatus then applied to the telephone subscribers line circuit in the manner described. So, on the other hand, the call-boxes or district messenger system may be first installed, and the line wires then made to do double duty by installing the telephone switchboard apparatus and the subscribers telephone equipment in such manner as to utilize the line wires already in use ing'ivino service from the call-boxes or other like cevices. Preferably, however, the call-box, and the signal receiving apparatus therefor, are installed and employed in connection with a telephone system which has been previously installed and put in operation.

In Figs. 3 and 4 it is obvious that no condensers need be employed in the recording or signal receiving apparatus connected with the subscribers lines to receive signals from the call boxes. This, of course, is for the reason that no battery current is employed on the lines for charging the transmitters at the subscribers stations. In Fig. 3, therebe done in any suitable the telephone system fore, the impedance coil 1? can be connected directly with the line, rather than through the condenser as shown in Fig. 1. Also, in Fig. 4 the two impedance coils I can be connected directly with the subscribers lines, rather than through the condensers shown in Fig. 2.

What I claim as my invention is:

1. The combination of a subscribers telephone line, suitable signaling devices, a source of current for both talking and signaling purposes, and a signal circuit including signal transmitting and receiving devices and a central source of current which are distinct from the means employed in furnishing telephone service, the said subscribers line including only a part of the said signaling circuit, the signal receiving devices being located at a central station.

2. The combination of a metallic line circuit, a central battery for charging said line circuit when the latter is closed, telephone apparatus suitably connected with said metallic line circuit, a signaling circuit including a call-box, and a relay and an alternating current generator in said said call-box and relay beingdistinct from the means employed for furnishing telephone service, and the said signaling circuit also including impedance and capacity interposed between the said relay and the. said metallic line circuit.

3. The combination of a telephone subscribers line, and a signaling circuit including a call-box and an alternating current generator and a relay, said call-box and relay and generator being distinct from the means employed for furnishing telephone service, and the said telephone subseribers line including a part of said signaling circuit.

4. The combination of a complete telephone exchange system, a signaling system, a separate central source of operating current for each system, the signal transmitting and receiving devices of the signaling system being distinct from the means employed for furnishing telephone service, but one or more of the telephone circuits including part of one or more of the signaling circuits of the said signaling system, whereby the transmitting and receiving apparatus of the two systems, although distinct from and independent of each other, utilize simultaneouslythe subscribers line wires which. are common to both systems, each system having a distinct or separate central station.

5. A system comprising two distinct electrical transmission systems each having a central source of current, adapted to operate simultaneously, whereof the entire transmitting and receiving apparatus and central source of current of each system is distinct from and independent of the transmitting, and receiving apparatus andsource of oursignaling circuit,

ren't'of the other system, but wherein one 7 of current common to said lines and adapted Illinois, this 18thday of November, 1904. 7

MARTIN J, OARNEY. Witnesses CLARENCE M. THOME, LUcY W. WRIGHT.

"Copies of this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents," 7

' Washington, D. C. 

